GMC 2005 T-Series Owner's Manual page 257

(6) = Inspect brake lines and hoses for proper hook-up,
binding, leaks, cracks, chafing, etc. Inspect disc
brake pads for wear and rotors for surface condition.
Inspect caliper assemblies. Check brake pedal for
excessive free play or travel (or every 6 months,
whichever occurs first) and have serviced if needed.
Check brakes more often if driving habits and conditions
result in frequent braking.
(7) = Inspect parking brake drum and linings for wear or
cracks and check linkage and adjustment.
(8) = This vehicle has the Engine Oil Life System. This
system will show you when to change the engine oil
and filter – usually between 3,000 miles (5 000 km) and
10,000 miles (16 000 km) since your last oil change.
Under severe conditions, the indicator may come
on before 3,000 miles (5 000 km). Never drive your
vehicle more than 10,000 miles (16 000 km) or
12 months without an oil and filter change.
Remember to reset the Engine Oil Life System
whenever the oil is changed. For more information, see
Engine Oil Life System on page 5-18.
(9) = Inspect rear axle air shift motor for fluid leaks.
Remove plug to check fluid level. Inspect air lines and
hoses for proper hook-up, binding, leaks, etc. Inspect at
1,000 miles (1 600 km) and 22,500 miles (36 000 km)
and then every 22,500 miles (36 000 km) thereafter.
(10) = Chassis Lubrication Service: Lubricate all grease
fittings in front suspension, front axle and steering
linkage. DO NOT lubricate kingpin bushings with air
pressure equipment; instead, use a hand grease gun to
ensure complete purge and eliminate sealer cap
distortion. Front axle tie rod ends, both upper and lower
kingpin fittings and both steering linkage relay rod ends
should be greased with the vehicle loaded on the ground
and wheels turned straight ahead, NOT with the vehicle
on a hoist. Apply kingpin bushing lubricant to both upper
and lower kingpin grease fittings until new lubricant
purges from between the upper shim pack and thrust
bearing. Lubricate transmission and shift linkage, hood
latches and hood hinges, parking brake lever pivot, clevis
pins and linkage, disc brake caliper rails, clutch linkage
and release bearing (if equipped), bearing pads,
propshaft universal joints, brake camshaft bracket, slack
adjusters, pedal shaft, clutch cross shaft, clutch pedal
springs and clutch cable bushing at transmission.
Lubricate suspension, axle and steering linkage more
often when operating under dusty or muddy conditions
and in excessive off-road use. Frequently power-washed
vehicles will require more frequent lubrication.
6-19